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Author Topic: How to define root cause ERS 4500 CPU peak  (Read 4410 times)

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Offline radeon9100

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How to define root cause ERS 4500 CPU peak
« on: June 25, 2013, 03:00:08 AM »
Hi all,
       I had some ERS4500 that CPU reach 100% then traffic slow down. How to fine root cause of this issue. Now I had reboot it and CPU will reach 100% again in week or a few day. Can someone help to fix it.

      And i had question about prevent loop from client on ERS4500/4800 I need to shutdwon port that generate loop on my 4500 please advise.

Regards,
Radeon9100



Offline Flintstone

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Re: How to define root cause ERS 4500 CPU peak
« Reply #1 on: June 25, 2013, 03:52:32 AM »
Hi Radeon9100,

It sounds like you could have a loop re-occurring?  You will need to determine which port or ports are showing 100% traffic utilisation when the switch CPU is 100% and shut down one of the ports to break the loop.  You now know where in your Network to troubleshoot further and find the root cause of the issue?

If it isn't a loop it could be a multicast/broadcast issue?  To find out where in your Network is to check multicast/broadcast counters on your ports?  Using a Sniffer would also help to track down the offending device?

CheerZ and good luck

Offline radeon9100

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Re: How to define root cause ERS 4500 CPU peak
« Reply #2 on: June 25, 2013, 04:47:02 AM »
Hi Radeon9100,

It sounds like you could have a loop re-occurring?  You will need to determine which port or ports are showing 100% traffic utilisation when the switch CPU is 100% and shut down one of the ports to break the loop.  You now know where in your Network to troubleshoot further and find the root cause of the issue?

If it isn't a loop it could be a multicast/broadcast issue?  To find out where in your Network is to check multicast/broadcast counters on your ports?  Using a Sniffer would also help to track down the offending device?

CheerZ and good luck

Thank you I will check it

Offline radeon9100

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Re: How to define root cause ERS 4500 CPU peak
« Reply #3 on: June 25, 2013, 07:34:11 AM »
Please help to suggest which parameter from show port-stat that can specific it's loop exist on port ??
Mineral_1#show port-statistics
Port: 1
--------
Received
    Packets:                 1383349
    Multicasts:              27290
    Broadcasts:              625
    Total Octets:            261024837
    FCS Errors:              0
    Undersized Packets:      0
    Oversized Packets:       0
    Filtered Packets:        0
    Pause Frames:            0
Transmitted
    Packets:                 2267471
    Multicasts:              137043
    Broadcasts:              77524
    Total Octets:            2631980867
    Collisions:              0
    Single Collisions:       0
    Multiple Collisions:     0
    Excessive Collisions:    0
    Deferred Packets:        0
    Late Collisions:         0
    Pause Frames:            0

Packets     64 bytes:        85735
            65-127 bytes:    1305831
            128-255 bytes:   274413
            256-511 bytes:   189968
            512-1023 bytes:  75623
            1024-1518 bytes: 1719250
     1519-9216 bytes(Jumbo): 0
    Dropped On No Resources: 34

Hi Radeon9100,

It sounds like you could have a loop re-occurring?  You will need to determine which port or ports are showing 100% traffic utilisation when the switch CPU is 100% and shut down one of the ports to break the loop.  You now know where in your Network to troubleshoot further and find the root cause of the issue?

If it isn't a loop it could be a multicast/broadcast issue?  To find out where in your Network is to check multicast/broadcast counters on your ports?  Using a Sniffer would also help to track down the offending device?

CheerZ and good luck

Thank you I will check it

Offline Flintstone

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Re: How to define root cause ERS 4500 CPU peak
« Reply #4 on: June 25, 2013, 08:56:04 AM »
Hi radeon9100,

Probably the best parameter to look at is:

Dropped On No Resources:

CheerZ

Offline Théo

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Re: How to define root cause ERS 4500 CPU peak
« Reply #5 on: July 10, 2013, 03:40:20 AM »
Hi Radeon9100,

You have few tools too find loop root port(s).
- show rate-limit
-> display pourcent of broadcast/multicast per port.

- show  mac-address-table port <all without uplinks>
-> if you have more than one or two mac address on a port, it could be a sign.

- show port-stat
-> check dropped on no ressource, broadcast and multicast rate
-? you should do a clear-stat on all interfaces before checking.

Then, to protect your device against loop, you should activate two things :
- spanning-tree fast learning
-> same as stp
- spanning-tree bpdu-filtering
-> check if receive bpdu and shutdown port if receive one. re-enable port after 120s by default.

Good luck ;)
ACIS 6103 - ACSS 3605

Offline MatzeKS

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    • matzeks
    • Controlware GmbH - Germany
Re: How to define root cause ERS 4500 CPU peak
« Reply #6 on: July 10, 2013, 03:53:00 AM »

Then, to protect your device against loop, you should activate two things :
- spanning-tree fast learning
-> same as stp
- spanning-tree bpdu-filtering
-> check if receive bpdu and shutdown port if receive one. re-enable port after 120s by default.

==> and SLPP-Guard on all access ports

Good luck ;)
------------------------------------------------------
ACE-Fx #00050